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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82ea605636f56c6c19535c6a7a2d55a0656f346347d00c643722a300b521a819' 
  AND token = 'H0cKghFhRkRHBPkT3QaNEb+BbwMpfCpeDJ02063SPdU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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