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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba00f4b0cacfd0bcb9fef35a455a04a578929dfe9784825efe5a27e6a5aaac4b' 
  AND token = '2oU8n1MkYIC6epps2cuVk2wFkRE5iqw9mYjaNSHmgus=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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