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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e91f4e9b70b18372085a3d73df64bd355e4b53a4c0c6b5fe9828463373119f5a' 
  AND token = 'xDn9iT9lS0XVWPhAIr0ahGbHRHlivUCiVL2Rzj2DL3I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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