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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb8bcc21cc1eab5746880783a7cbe154cdcb3c901c8b9917d45f050c1ac1644d' 
  AND token = 'a+lllsrc8tLEaBf3XPUdwjkwPJEsVzm+gPKQDgTyMyk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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