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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bc51423d653c5a96cbf138d433a3df8cd086e53802ee5c0a61c048607e5ca40' 
  AND token = 'etuj6eRdWaODgZNu9YbOOdKuFrzpunz3n70xzX8T1wU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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