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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'acd89a2884931fa5de041e9d8cefaafbb8a96189a482e9c2e59d4294b5f66b8b' 
  AND token = 'ss2io2nbGpoUoiq81pixEtQ+rkrSCgyDytQHQjxSs64=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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