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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f86dab50fd8eb71b09a2e67cafb6341f10af0a9eb95a12c5dc7bcb8c064dfab2' 
  AND token = 'hoSmm036O5I46A8MfwSoPyBzZZ4nNZXSJhj/t1uHUe8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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