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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '700f56660093606c69739e61f76a1ea292ac11754c0799ed9400b6acae4b660b' 
  AND token = '6D1FYc73Zi6xfyB9jwVB9abIlIBt3tlsREjCeSR2Tww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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