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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62b1c5876feee14122e9a4622c4771968589cf6f1f6d7610b4bd29cad69f2925' 
  AND token = 'i/H+fJNJyo0PRAWYTf5QoLId92TXwLYZgOFK9d+PGwo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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