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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6427c57abf5a6b5d3b4ae55205ee64deee53db8eb7a0b1c28f19e59f88a7be8c' 
  AND token = 'iaf06TeSSPj1CALKTWE5wb56sV5NS4s2S+1vQ65+2DA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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