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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a75db23860c180da5768fb2a76a8928c68f9005666584ca933e3e322e0b0f072' 
  AND token = '6eB5NVPfyoeF60ct1dqBj2UPQGfXxdtpvzWLYsCBxhU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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