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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd2443a6e4a35e13219c201c69921b4526c41308f9ab9d1d72235b5b2562b102' 
  AND token = 'Xnl8e/irfxhApLnqtOlzFjaHlqB5beKL2dB6PmJHaNc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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