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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '237d4c1893e84f7f98ae1007749a172122762bbec656a96cc400cbdd3b8177ef' 
  AND token = 'a9t+ulIfL2lfq9N44DkhEnJpYYCjcMdgtA/Fo5u98Ns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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