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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19b0d7035a8a4c73de3c944961c889a0c0b883a5b5a7f33a005f23e314674f15' 
  AND token = 'Prdg51NhAf/mYnGvj21UWit/xdJOPJs7qAlu8lm3jnA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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