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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '777ee161486eae9ec9034d58256131adb29fc9537403ba1f6c8e97212824750a' 
  AND token = 'b3TmtfXtTIBBox2OQim9fCuF02R5hRgcIVNvCN8eYHQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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