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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d58ac2a92f77e7b5ee709a4e305c95f617ee506aef37512e98460245122ec88' 
  AND token = 'VBTB516ASMBtR05Erl5451epQbqHKBsxKtK2PyCRSNE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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