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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7137057e07aa196e3c7b0010601ea926d20f06fbf266d409ca7a2256de8f911' 
  AND token = 'hvmJIhU3n9cBwPrNmMN2JRYZF5jSjjtDR2/kZmMSixY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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