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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fc83b553e2ea4169166df8dd8b83a0b740b1eb8974d7e8a55c52d3e4f33213c' 
  AND token = 'V6+Arzz4+YXUEuPNRli8pzszFjVj53w5QPSu4quD48M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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