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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '973066b439be2a2ca3c8afa1fb8d9a3c9e49e62e7beba7efeca7890b508afe1c' 
  AND token = 'GgfiL6NyrCxm3Lvi3KljrVuA2bQFH0ydFq4BY9WDFZE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}