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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6c3496ed05aa903f87698d85c1d7d11a395bcdf973841c2859c409eba7589b0' 
  AND token = 'acQu6Hu5gpWubrpmqwLOeBurfsfREvNu+3ES14SEcug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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