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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f14420bec04ea17daa2b0663ed60958f18022c12ec48b4f6122822553a76b8a' 
  AND token = 'H5uwOxQ4yi45IuPwv/1xcYZxwMPBKmfekwgcCZ1BQIc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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