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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9585d0555be581f87fda43d367a8d367ab28bc4a23b305b63052be6f606ec288' 
  AND token = 'bMmEPBS64LNWaEQ57WPU4MSbmnLA/gQtNn80We1Km0g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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