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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfe15e725553cff2a48577307e283ac2588a91d4d17f76a5f78f85cc37d68ed5' 
  AND token = 'GnjOkzRxR8GUSPyzR2CYrM5U9XEwl/QE6ioLGWsc0S0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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