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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '349bfa3c0c36c6cb93941d39472b823473b7d3f6a22e15055ddec6322c35891d' 
  AND token = '4BfqHp8185SLLNE2lRYKhVcnS7bw9KGl4S5G/wQD+F0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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