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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '246b97c85cad63f16cf0085890d6dc7817eac6abe6ec7100bff74a1a1b85bd07' 
  AND token = '3rxT/m9z8O0/zrzkYabqKaLJhUhEdN0Lophn4d3TVVk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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