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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1dee064ffa76ab99b70da62e34c7266fdfe3860e444a90cbebffad2d528cbc65' 
  AND token = 'akit54k6eNFMyXeYMlMcrIhUm1xocKlyMi4VtGDCT/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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