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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebc10524bced314e3fcf9edd87d629df09d9b8bfe7936d5cf623ed160212eae6' 
  AND token = 'BujqMtQl5tqVz49+vT1+cVGeZM4PamZyhFU2bLWxFRs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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