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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8462dcb15483a0550bd20cd68d4831693fa780b087a9f7085200fbc9e4e3716a' 
  AND token = 'f1pIRcqMIVIxQQFcgnzoVwEHQRma1EeBHNsHwie58Vs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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