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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '993de9edc8da78faa280a39a7935bf4e8aa695e8eea74b326d8e5c39471586bb' 
  AND token = 'juD071fHL3oau7a2lXuj2HQdZ+XbrUwF9FUK13h8Cns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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