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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '718bd916d2f2ccddc132efe508a6a3e785518a043677c41396146a3a61863be1' 
  AND token = 'THQaxliIBRrBpLiiHhwVXyOU2SWLpUCHo2IX4TXK6AA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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