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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64cfbc9262b5b0cd2d3e33b828d42f6e92a05be64ca3662429138fd9600d52be' 
  AND token = 'Dxk5M336d75jCu8E6X3hMFry8ebTEtZXvx1vmIu69ns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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