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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad2940c30e07e394820d7aa5d0c8d6634e6a67875556930d33d7551e694d57d3' 
  AND token = 'rzKW69Lth3IBfPfqqJvBa4fJJF7QGIvD6f0oBoXa9F4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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