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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0273930199ff6eaa452ad3f0e877038fcf49907761fbc8d75ef340b4f63608b1' 
  AND token = 'ctgSmdFVMW1DaZTMPCRmUfIxXG8Xm2OZ6A8R9D1/5NM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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