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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e745b08cd7d40089ae70d670132f5c5e4f43f1214c6cc92712101af137794804' 
  AND token = 'cXc5n8W3j9NxLDCqFslsbeMoQO1xPnku/rjyX3JJp4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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