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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a76d4d4f3ce993be61e69f2e8619981b4c0b89a8918b78b7867ef9eea132e5c6' 
  AND token = '/qETmOK7+v41H6kKMMuDYWuIvicUu/k4MgldgH1iP90=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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