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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ae608fb75d1b29eb4d0ac32b0f60351e30a00b1499501d035dfb9f99d0abbd5' 
  AND token = 'Ca41cqbguLEi0WhzohuL2LNNd2gvFkvWgw6GdtsaxtE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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