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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97386484543328677dbd22bd9bc076204cf585eff259a15dea3ad032b43a0608' 
  AND token = 'xN9DlcRMzD6mz/knmhgQMV+QECG1lCHSt3s4QXijOM4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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