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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0066fa40219a6d3d58ea972850a09736b4cb628f20c285ec7be826a626fc9bc' 
  AND token = '0lsWpEqu2Kt9JkFy6dRw+X6QppKzSffMdgShDYhRcm0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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