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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '655837417982d6f52ba343017ce8a5b0f37dd29022a35a7bc23396e3de21b0bf' 
  AND token = '7qRVS/SrGISnAn0jdJqeDxursuaod9Pu3lioqDnw3Mw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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