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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e04a0468b6155f051abeb9c0b75518f95b51b0f54957f8e36964ad37ec1d5ae3' 
  AND token = 'i7yj/GfXblChvRfpqfxTQCsKOkvWYunnpSwpFqUAdYs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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