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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '277484417c0ffbdcafd24fa0b8e0d5a93677527c036123d1f3370b0ddf425bbc' 
  AND token = '8VuTvBK7yMZ9CkIKbk6maDD4JBy79Rf0flfHlJDMb1Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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