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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '887e88d6388172412e16c8d7f7d5388520b90eab812e607af2c00ff8c4ccfddd' 
  AND token = 'zYPx/sPvvQbeF72VTglnFGioby94Pl5MD97Vfl6hjAQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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