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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0eb63742de4d13e5a1bd8ad9b9fc98bf8d8a4977f54d178b24908ffdb204ed02' 
  AND token = 'JxzcFaV24FNGdYieDH5k/HNXaHvGMF2DLI5nnlPZPu4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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