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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebb2ace4a397d2f22988e7e602ac91c60bf854989a8b61250333557474be39b9' 
  AND token = 'duQ1kneUaYyKCsotUhJsjMnz62d6p4y/Gi+Sn5gSF+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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