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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23531c54ce4b4b257a6275ebcdf984e14347b9d8e7a6bf435ba07859c426e430' 
  AND token = '6NExC2uqSc5ma91BWvA4aeKItSF0SazOmdPgwygRITo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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