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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa3e56d24a2ac33a90afc3a180c1fa54c08954a26bf3aabcf55e344673575d1a' 
  AND token = 'sLCFSSxoDB2lJIY6A+oY+cuEWDmmDhaTmoAbjZbXyRU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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