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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7159189054cc40eb62fb6875d8f4c516a5f8e8527a7770466d5d4fb8d506100' 
  AND token = 'F1c4FiKxup712yWccV5qlkrNf6nHr0ue646EJO0F7lI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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