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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad4d7dbc94d3a93e079cb09e901588acc691e670d216d4db36a7cfd1ee308185' 
  AND token = 'oAuhs9KIKJ0Wox6OQ4N3Fos52UArcIATp68utrhQNGE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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