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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2b6f1524c7a1c796150c0dd18b4b52fb6d662c7c5e22191429d52fd03e2dcd7' 
  AND token = 'xs0tHbxrlTTDsqyMV5FzkVr0ShDb+o+j7ndsJcPp82o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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