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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1d05208cfee3687f506addf6af43da9b12abe1269626585525fcb86d73f4c1e' 
  AND token = 'g/x0mn/Fd3l371z6YPDEoJ2XyXeGwF2yfeUgF58BodM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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