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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ccf79d11382007cff4d915ef6ebc86fe2de4c121ab5769d869adbc506835630' 
  AND token = 'rQZTDeGevNDYDKA++RTixil5G3dzuSUYSRCyFe4EljE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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