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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c64556ec282a16333cd02caf3fc7b8f210876d661d902ecdc73c56239f9c1960' 
  AND token = 'vgH0mmQ9M6ynsMJvKpQgNr2bLE17HNZmPC5xfxgI0fo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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