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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1179b56c99c4c215e4baa2654aab27e2e046aef802cf6b1569826d52e546f8b9' 
  AND token = 'OC6IWUSHpN2ImEpptXeT40TGRq+Z01p5INi9caH9pfU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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