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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e55ebfb8cae5015d87d109f4880ccd3c991158083a49308d93af92ac3d4f9b5' 
  AND token = 'yuS76eqFLedXL1+jBCDQKaQaRJ/lnsMg/gema09Baps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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