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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7688d8627b50e2ab2b08c81b70ba24ef1bb64b4ff6d7dcb61cbe314f7a276d9a' 
  AND token = 'RaNG2Qk6T0IIKDpF7GAER+fcd9H/wF/08dov2Ex2LAQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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