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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a0999363e2c047806c2264057fe9cb25bc2dd5cba1f7b4579eb1ef9e19ac5fa' 
  AND token = 'mKJuHBE6SMhl4qJMCzWb5KSeOmNVK/m5XD5YfKGMf6w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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