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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '832396115c27a4e89a4d64af531d492a40b57b1db6c1d71ce1b785ab382d7846' 
  AND token = 'aF/3rLdgDReO5e/+wnjNS5KQaoceTifWhByjV8c+GCY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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