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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df8e451db5ec725aa12ea74e8679952fe292d7a5a70d8b50b9319ca054c9695a' 
  AND token = 'RSoGvDXPh4OGFXS4uouUVZ6JPuXXhbQer2fb0Kt2B/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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