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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed2ba1b143a147ade0ff03649cffe93c5b51f1c67c8321f5bc37c5a90e2e21f2' 
  AND token = '6N6gxlA4AqYIllQUSaxmun9lDrIXsNJj6AnpQrB9GCc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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