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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b57a39055cb2db63fa1bebbed2ffa2743d97cfd421568ddf1be4c959a2ffe52' 
  AND token = 'aDQf3BZEJ6vfMzO4bLkRCmYBNr3kkBJhAxRhzidaH4g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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