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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3448a8d4ced145be01724bb08cf3e6f257bea92e5cfca413d1c331a8c2a841e5' 
  AND token = '4ESdNC4KiVLEVco0K7xXe7Z6C/iDACLsRRyeclCqBuw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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