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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99997c038dbef2c2947fa8233cabaca4237dc780f5730a2a5db0e899ca654235' 
  AND token = 'gfL0kzwvU+7YUFN8rHIaS5xURV20dI2NjKtABW7UQCM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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