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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '932d3f33282cb2a4f5c1199cc2ad0ef25bb66511ebc777f4bde2827cc8a5f620' 
  AND token = 'mMs3MtDLYoK06rmIuHwsWpqNPo6ohXe/pC2xuqcECr4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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