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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffdce10a586fa3def9d4c93bf510cb5178a12e77e043cc12c437b3d4132ded29' 
  AND token = '1l9zODGEz/DKlB2YFMPV2W5mMLKwvTmKFKBo51AT1Dw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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