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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a34c3ec607927e08fb68323aef68db24346993a23fcd93463698d2e1c294942' 
  AND token = '0wmAIX8PPW0fxFsXbM3GexzRNN0UNuB9MbkUrrNL1p8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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