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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '762248d6dd1e4b9c02c6f879f4a08a2c53667f248299241fcae11f2123382ba4' 
  AND token = 'FaweuhY+mGDMDtVg8cWfmhId+1ZFx9DF8i7FUGVHs+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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