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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '331d733997967660f5f4ae2c457eaa98b407e936bbee7276431efde78bec8fb5' 
  AND token = 'wP4e8qeW1IfrThWtb7+iAgSZem8C96j9GDRmH9coolI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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