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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86c34c02dfa5812c1af3c082076f728c9e49b59219e30b83b6bd25797234e0fd' 
  AND token = 'rGyfRW9PI9j7MPsCACWFP9imqvjyApjaWIdHkHFPda4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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