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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52384b46923f46a3e3f950ac3369fe990bd4f25a2ccedad0a9728bd63c84624a' 
  AND token = '/ddO0C6A5rhwKT8PRl9OOUSnZW/Gl35X7Gpy2n8ZR0A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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