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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb2ff3378668a6fda7b80b1715ace50a805daa7242b0167e799424a2bf9dd761' 
  AND token = 'M7CJdgbx77wweT2NKqcRZ4VrFageRk/wCC7soroVIQg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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