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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2a4a38d6de22fbab68d03240799254c1f4876968cb0458eb113e59adc7c01f0' 
  AND token = 'Mu8FunobagbnHFDq4ax8V09oLlpdkInobX1X1PiAWtU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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